Device for drawing or rolling, especially for the production of frustoconically shaped bodies and the like



- July 17, 1962 D, GR WN. 3,044,331

DEVICE FOR DRAWING OR R ESPECIALLY FOR THE PRODUCTION OF NICALLY LIKE OLLING FRUSTO-CO SHAPED BODIES AND THE 3 Sheets-Sheet 1 Filed Jan. 5, 1959 mm% Q G E m y 7, 1962 D. GROPPINI 31 DEVICE FOR DRAWING OR ROLLING, ESPECIALLY FOR THE PRODUCTION OF FRUSTO-CONICALLY APED BODIES AND THE LIKE 3,044,331 OR THE 7 July 17, 1962 DEVICE FIG.5

United States Patent. Ofiice i 3,044,331 Patented July 17,1962

DEVICE FOR DRAWING OR ROLLING, ESPE- CIALLY FOR THE PRDDUCTION F FRUSTO- CONICALLY SHAPED BODIES AND THE LIKE Diego Groppini, Dalmine, Italy, assignor to Dalmine S.p.A., Dalmine (Bergamo), Italy, a firm Filed Jan. 5, I959, Ser. No. 785,074 4 Claims. (CI. 80-59) The present invention deals with a drawing or rolling device, especially suitable for the manufacture of truncated cone or similar shaped products.

The greatest defect in present day production methods, wherein the material is drawn through one or more-rotating devices having grooves of progressively varying crosssection, consists in the inability to obtain suitablydesired reductions in diameter with each groove passage, and the consequential inability to render these methods both practical and economical.

The device, which is the subject of the present patent application, obviates the above mentioned inconvenience and defect, and is substantially characterized by the fact that it comprises at least two rotating elements with their axes on the same plane, and shaped in such a manner as to obtain the drawn orrolled cross section required; these elements work in conjunction with one another at at least one part of the drawing or rolling cross section by means of teeth or similar devices, and which, by their intermeshing with one another, can produce a continuous shape profile even at a distance from the plane of the rotation axes.

The invention will be described with reference to the accompanying schematic drawings which are given only by the way of example (indicative example), and not limitative of the range of the invention.

FIGURE 1. Shows an elevation front view of a device with three rotating elements in the position of the maximum drawing diameter opening.

FIGURE 2. Shows a cross section through line 2-2 of FIGURE 1. 1

FIGURE 3. Shows an analogous representation of the device as according to FIGURE 1, but at the minimum drawing diameter opening position.

FIGURE 4. Shows a cross section through line 44 of FIGURE 3.

FIGURE 5. Shows an elevation front view of a three element device with a constant opening.

FIGURE 6. Shows a cross section through line 66 of FIGURE 5.

With reference to FIGURES 1 to 4: A, B, and C indicate the three rotating elements, which in the illustration, have their rotating axes on the same plane, and are arranged as per the sides of an equilateral triangle. The three elements are therefore equal to each other. These three elements are so shaped as to produce a circular drawing bore having its center in the center of the triangle composed of the' rotating axes. The diameter of the circular cross section is variable in a continuous manner, as can be clearly seen from FIGURE 2, in which the element B is shown in section across the middle plane perpendicular to the axes, and that is tosay in correspondence with the bottom of the groove which provides the drawing or rolling bore.

In FIGURES 2 and 4, the tubular shaped metal being operated upon is shown as D, whilst E and F indicate respectively the outflow outline at the bottom of the groove zone, and at the toothed zone.

The rotating elements A, B, and C, comprise bevel pinions, and are suited for motion transmission between two axes situated on the same plane, and at an angle of 60 to each other (angle contained in the apex of an equilateral triangle). I

Meanwhile, the pinions mesh together, two by two, and establish the geometrically shaped figure shown in both FIGURES l and 3.

The central concave shape of each element A, B, and C is formed by the body of the teeth and the bevel pinions; teeth, which theoretically, for a drawing bore diameter almost equal to twice the maximum height of same, can cooperate completely with the concave shape of each element A, B, and C.

The drawing bore is at least partially formed by the tooth part of each element (i.e. rotating element). The meshing of the teeth creates the continuous inflow (that is to say that the bore outline is substantially continuous), even in planes parallel to the plane containing the rotating axes, and at a distance from said plane. In such a manner, and with the device described, fair sized diameter reductions, and perfectly circular sections can be obtained without any inconvenience. f

In the example illustrated, element A is the motor element, and receives transmission by =means of the main shaft 1. On the other hand, elements B, and C, are freely held by pivot journals 2, and 3, and receive transmission from the bevel pinions of the motor element A.

The drawing or rolling bore can also be constant as depicted in FIGURES 5 and 6, and in which the parts corresponding to those shown in FIGURES l to 4 are indicated with the same references but provided with primes.

From the description given herein, it is evident that by means of the device hereof an adequate inflow is provided at all times, in all zones of the reduction operation.

It is to be understood, however, that the device may be varied in certain of its aspects without escaping from the spirit .of the invention, same being limited only by the scope of the appended claims.

In particular, the drawing or rolling bore can be of any shape and need not be limited to the circular shape as shown.

The number of the rotating elements can also be two, or more than three. In the case of only two rollers, these can be with rotary parallel axes, with upright or helical teeth, or also with converging axes, and bevel teeth. In the case of more than three elements, these can have the axes arranged as a regular polygon, or even irregular, as long as the conditions of correct reciprocal collaboration of the teeth parts is maintained.

In the case where the teeth shaping is not of the mating type for power transmission, it is obvious that the various elements must be individually controlled by means of other than the teeth proper of the elements; such teeth will control at least in part the drawing or rolling bore section.

I claim:

1. In a rolling mill for rolling tubular bodies, comprising: at least three rotating elements, each of which have toothed gearing on the end portions thereof and integral therewith, said rotating elements having their axes in the same plane and being disposed relative to each other so that said rotating elements provide a desired cross section of the article to be rolled, said toothed gearing on each of said rotating elements engaging said toothed gearing on said rotating elements adjacent thereto, said toothed gearing also engaging the article to be rolled prior to andat the gauge whereby the article to be rolled is given its desired configuration along its entire periphery prior to and at the gauge of said mill.

2. In a rolling mill for rolling tubular bodies, comprising:. at least three rotating elements, each of which have toothed gearing on .the end portions thereof and integral that said rotating elements define a bore having its center intersecting the center of the area defined by the axes of said rotating elements and provide adesired cross sec-' tiori of'the article to be rolled, said toothed gearing on each of said rotating elements engaging said toothed gear- 'ing on said rotating elements adjacent thereto, said toothed gearing also engaging the article to, be rolled prior to and at the drawing bore whereby the article to be rolled is given its desired configuration along its entire periphery prior to 'andat the drawing bore of themill. V

3. In a rolling mill for rolling tubular bodies, the combination of, at least three rotating elements having their axes in a common plane and. afiording die continuity in sections parallel to and prior to the plane containing the axes of the rotating elements, said rotating elements being disposed relative to each other so that said rotating elements define a bore having a minimum cross section corresponding in outline with the desired cross section of the article to be rolled, veach or said rotating elements having toothed'gearing on an end portion thereof and'in- 'tegral therewith, the-toothed gearing on each of said rotating elements engaging'the toothed gearing on said rotating elements adjacent thereto, the toothed gearing on said rotating elements also engagingthe article to be rolled prior to and at the minimum cross section of the bore whereby the article to be rolled is given a desired configuration along its entire periphery prior to and at the minimum cross section of the bore of the mill.

4. A rolling mill for rolling tubular bodies comprising: at least three rotating and cooperating elements, each said element having toothed gearing integral therewith on its end portion, said rotating elements being so configured and relatively so positioned as to each other to provide a drawing bore for imparting a desired cross section to the article to be rolled, the toothed gearing integral with said rotating elements being engageable with each other and being also engageable with the article to be rolled, the rotation axes of'said rotating elements forming an equilateral triangle 'With the center line ofthe drawing bore intersecting the center of the area defined by the equilateral triangle.

References Cited in the file of this patent UNITED STATES PATENTS 204,787 Bansen June 11, 1878 324,867 .Meatyard Aug. 25, 1885 817,360 Anderson Apr. 10, 1906 1,201,582 Hasselberg et al. Oct. 17, 1916 I FOREIGN PATENTS 7 180,009 Germany Jan, 3, 1907 

